Properties of extremely high molecular weight polystyrene in solution |
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Authors: | V Chrástová D Mikulásová J Lacok P Citovický |
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Affiliation: | Department of Chemical Technology of Plastics and Fibers, Slovak Technical University, Bratislava, Czechoslovakia |
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Abstract: | Extremely high molecular weight polystyrenes with a in the range 10.8 × 106 to 2.2 × 107 were prepared by emulsion polymerization initiated with a heterogeneous initiator at 30°C, which has a ‘living character’. Samples of polystyrene were characterized by light scattering and viscometry in toluene and benzene at 25°C, and in θ-solvent cyclohexane at 34.8°C. Also determined were the relationships of mean-square radius of gyration 〈s2〉 (m2) and the second virial coefficient A2 (m3 mol kg?2) on the molecular weight, which for toluene and benzene are described in equations: Toluene (25°C) ; ; Benzene (25°C) ; . The parameters in the Mark-Houwink-Sakurada equation were established, for extremely high molecular weight polystyrene in toluene and in benzene, at 25°C into the form giving for ; . The mentioned relations, as well as the obtained values of Flory parameter ?0 and of ratio were compared with solution properties of high molecular weight polystyrene with narrow molecular weight distribution prepared by anionic polymerization by Fukuda et al. |
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